Improvement in furnace-grates



"To all 'whom it may concern:

tiranti t-aies aient (titties.

ABRAHAM L. PnNNooK, or UPPER DARBY, PENNSYLVANIA.

' Letters Patent No. 107,715, dated september 27, 1870.

IMPROVEMENT IN FURNAC-E-GRATES.

The Schedule referred to in these Letters Patent and making part of the sari-e4 "thaart to make and use thc same, reference being had to the accompanying drawing forming part of' this specification. l

This invention relates to a new and usefulimprrwement in grates for furnaces, whereby they are made cheaper, more useful, and more durable than they have heretofore been; and

It consists in locking the bars together by means of lockingfpieees running` through and at right angles with the bars, thc said locking-pieces having notches for holding the loars, by means of which the distance ci' the bars apart may be varied, so as to adapt the grate to either coarse or inc-coal, as will bc herein- 'after more i'ully described.

Ilthe accompanying drawing- Figure l represents a longitudinal side view ot' the gratie; showing v.thc ends of the locking-pieces.

Figure 2 is a cross-section of g.i1 on the linea' :ver

Figure 3 is an end view of iig. 1. Similar letters of reference indica-te eorrespomling parts.

In this example of my invention two grate-bars only are shown locked together, but as this is all that Yis necessary toexplain the invention, it is presumed to be sniiicien-t. y

A represents the grate-bars, which are locked together at each end and in the middle, but I do not eoniine myself to any particular number of locks, nor to any particular location for them.

B represent-s the end locking-pieces, and

G thcv middle locking-piece.

Theform'of these locking-pieces isseen in figs. 2 and 3. They are simply thin pieces of metal, of a width not exceeding the width of the'grate where they1 are placed, with notches for receiving the grates, as seen in the drawing.

D represents slots through the grates, which admit the locking-pieces. The central portions of the slots are circular orifices, of a diameter sufiicient to receive the portion of the locking-piece between the notches.

In putting in these locking-pieces, they are passed y through the slots in the grate-bars, so that the bars correspond with the notches when y the` pie-ccs are turned either at right angles with the slots, as seen at the ends ot' the bars, or at a right angle with the bars when the slot is placed diagonally in the bar, as seen in middle of the grate. v

There may be more or less notches in the lockingpieccs, so that the grate-bars may be placed at a. greater or 'a lesser distance apart, to suit the different sizes of coal.

By the use oi' these locking-pieces the grate-bars may be made much thinner than they otherwise could be, and be durable. Consequently, the grate is more ope-n, thc draught improved, and a better and unorc perfect combustion of the fuel is produced.

The loose lockingpieces allow the bars to expand and contract without damage, and far less weight of metal is required in the construction of the grate.

The durability and utility of the grate are increased,

while thc cost ci it is materially lessened.

Having thus described. my invention,

I claim as new and desire to secure by Letters Patent In combination with the grate-bar, the slots D and the locking-pieces B and G, when the same are constructed and arranged to operate substantially as and for the purposes herein shown and described.

ABRAHAM L. PENNOOK.

Witnesses W. C. GRAY, l J. T. TEMPLE. 

